Diagnostic Test

WARNING: This page is about a different car, the 2012 Jeep Patriot and 2012 Jeep Compass. However, it is still accessible from the selected car via links, so may be relevant.

TEST FOR INTERMITTENT CONDITION
NOTE:
Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.
1. Turn the ignition on.
  NOTE:
  Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.
2. With the scan tool, select ECU View.
  NOTE:
  A red "X" will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.
  
  Does the scan tool display a red "X" next to the module?
  
  Yes
  - Go To 2.
  No
  - The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.
(A411) FUSED B(+) CIRCUIT OPEN OR SHORTED

Fig 1: Checking Fused B(+) Circuit Using 12-Volt Test Light Connected To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the Wireless Control Module harness connector.
3. Using a 12-volt test light connected to ground, check the (A411) Fused B(+) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 3.
  No
  - Repair the (A411) Fused B(+) circuit for an open or short.
  - Perform the WCM VERIFICATION TEST. Refer to WIRELESS CONTROL MODULE (WCM) VERIFICATION .
(Z937) GROUND CIRCUIT OPEN

Fig 2: Checking Ground Circuit Using 12-Volt Test Light Connected To 12-Volts
Courtesy of CHRYSLER GROUP, LLC
1. Using a 12-volt test light connected to 12-volts, check the (Z937) ground circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4.
  No
  - Repair the (Z937) ground circuit for an open.
  - Perform the WCM VERIFICATION TEST. Refer to WIRELESS CONTROL MODULE (WCM) VERIFICATION .
(F20) IGNITION SWITCH OUTPUT CIRCUIT OPEN OR SHORTED

Fig 3: Checking Ignition Switch Output Circuit Using 12-Volt Test Light Connected To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition on.
2. Using a 12-volt test light connected to ground, check the (F20) Ignition Switch Output circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 5.
  No
  - Repair the (F20) Ignition Switch Output circuit for an open or short.
  - Perform the WCM VERIFICATION TEST. Refer to WIRELESS CONTROL MODULE (WCM) VERIFICATION .
(D55) AND (D54) CAN B BUS CIRCUITS OPEN

Fig 4: Measuring Voltage Between CAN B Bus (-) Circuit & Ground And Between CAN B Bus (+) Circuit & Ground
Courtesy of CHRYSLER GROUP, LLC

NOTE:
One open circuit will not cause this condition.
1. Measure the voltage between the (D54) CAN B Bus (-) circuit and ground.
2. Measure the voltage between the (D55) CAN B Bus (+) circuit and ground.
  Is there any voltage present on either circuit?
  
  Yes
  - Replace the Wireless Control Module in accordance with the Service Information.
  - Perform the WCM VERIFICATION TEST. Refer to WIRELESS CONTROL MODULE (WCM) VERIFICATION .
  No
  - Repair the (D55) and (D54) CAN B Bus circuits for an open. Inspect the connector for damage.
  - Perform the WCM VERIFICATION TEST. Refer to WIRELESS CONTROL MODULE (WCM) VERIFICATION .